Open vocal chord Soft palate 8. [EXAM-LIKE] The vocal cords, two lip-shaped memb

Question

Open vocal chord Soft palate 8. [EXAM-LIKE] The vocal cords, two lip-shaped membrane folds in Tongue the upper trachea as indicated in the figure, are responsible for vocal sound production. The voices of males and females often have different sonic characteristics: Male vocals have an average fundamental frequency of about 140 Hz, while female vocals have an average of about 230 Hz. Trachea Closed vocal chord Using the frequencies given, calculate the wavelengths of average male and female vocals in air. (You may need to use the speed of sound in air, which is a value you want to memorize, to one sig fig, for the exam.) Draw two horizontal lines to indicate a "tube", closed at the left (where the glottis closes the vocal chord) and open at the right (lips). For the air displacement (not for pressure), at which side will there be a node (i.e. where there is no room for air displacement back and forth)? a. b. O MAYO FOUNDATION FOR MEDICAL EDUCATION AND R ESEARCH. ALL RIGHTS RESERVED straightened out' vocal tract nasal tract li c. At which side will there be an antinode [i.e. where air is glottis oscillating back and forth)? Draw the fundamental (lowest frequency) standing wave that will occur in that open-closed tube d. e. What two lengths would your tube need to be to result in the female and male fundamental f. Use the figure provided to explain whether or not it is accurate to simply model your vocal cords an g. Hypothesize, using 5B physics concepts, one possible reason why our voices tend to get deeper a:s frequencies given above? open-closed tube that produces sound when the vocal cords are closed we grow from childhood to adulthood

Explanation / Answer

a.

We know that the wavelength = c/frequency

Wavelength = 3.0 x 108 / 140

= 2.14 x 106 m

For female

Wavelength = 3.0 x 108 / 230

= 1.3 x 106 m

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